11520437421 has 8 divisors (see below), whose sum is σ = 15509715520. Its totient is φ = 7605725472.

The previous prime is 11520437353. The next prime is 11520437443. The reversal of 11520437421 is 12473402511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11520437421 - 2⁹ = 11520436909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11520437471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18641176 + ... + 18641793.

It is an arithmetic number, because the mean of its divisors is an integer number (1938714440).

Almost surely, 2^11520437421 is an apocalyptic number.

It is an amenable number.

11520437421 is a deficient number, since it is larger than the sum of its proper divisors (3989278099).

11520437421 is a wasteful number, since it uses less digits than its factorization.

11520437421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37283075.

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 11520437421 its reverse (12473402511), we get a palindrome (23993839932).

The spelling of 11520437421 in words is "eleven billion, five hundred twenty million, four hundred thirty-seven thousand, four hundred twenty-one".